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OpenGL: Implement fog

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This commit is contained in:
Jannik Vogel 2016-05-21 01:04:57 +02:00
parent ebee2513a9
commit a12571c709
5 changed files with 124 additions and 7 deletions
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68
src/video_core/renderer_opengl/gl_rasterizer.cpp
View file

@ -62,6 +62,8 @@ RasterizerOpenGL::RasterizerOpenGL() : shader_dirty(true) {
uniform_block_data.lut_dirty[index] = true;
}
uniform_block_data.fog_lut_dirty = true;
// Set vertex attributes
glVertexAttribPointer(GLShader::ATTRIBUTE_POSITION, 4, GL_FLOAT, GL_FALSE, sizeof(HardwareVertex), (GLvoid*)offsetof(HardwareVertex, position));
glEnableVertexAttribArray(GLShader::ATTRIBUTE_POSITION);
@ -102,6 +104,18 @@ RasterizerOpenGL::RasterizerOpenGL() : shader_dirty(true) {
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
// Setup the LUT for the fog
{
fog_lut.Create();
state.fog_lut.texture_1d = fog_lut.handle;
}
state.Apply();
glActiveTexture(GL_TEXTURE9);
glTexImage1D(GL_TEXTURE_1D, 0, GL_R32UI, 128, 0, GL_RED_INTEGER, GL_UNSIGNED_INT, nullptr);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// Sync fixed function OpenGL state
SyncCullMode();
SyncBlendEnabled();
@ -215,6 +229,12 @@ void RasterizerOpenGL::DrawTriangles() {
}
}
// Sync the fog lut
if (uniform_block_data.fog_lut_dirty) {
SyncFogLUT();
uniform_block_data.fog_lut_dirty = false;
}
// Sync the uniform data
if (uniform_block_data.dirty) {
glBufferData(GL_UNIFORM_BUFFER, sizeof(UniformData), &uniform_block_data.data, GL_STATIC_DRAW);
@ -280,6 +300,21 @@ void RasterizerOpenGL::NotifyPicaRegisterChanged(u32 id) {
SyncBlendColor();
break;
// Fog state
case PICA_REG_INDEX(fog_color):
SyncFogColor();
break;
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[0], 0xe8):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[1], 0xe9):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[2], 0xea):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[3], 0xeb):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[4], 0xec):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[5], 0xed):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[6], 0xee):
case PICA_REG_INDEX_WORKAROUND(fog_lut_data[7], 0xef):
uniform_block_data.fog_lut_dirty = true;
break;
// Alpha test
case PICA_REG_INDEX(output_merger.alpha_test):
SyncAlphaTest();
@ -329,6 +364,7 @@ void RasterizerOpenGL::NotifyPicaRegisterChanged(u32 id) {
break;
// TEV stages
// (This also syncs fog_mode and fog_flip which are part of tev_combiner_buffer_input)
case PICA_REG_INDEX(tev_stage0.color_source1):
case PICA_REG_INDEX(tev_stage0.color_modifier1):
case PICA_REG_INDEX(tev_stage0.color_op):
@ -950,9 +986,15 @@ void RasterizerOpenGL::SetShader() {
uniform_lut = glGetUniformLocation(shader->shader.handle, "lut[5]");
if (uniform_lut != -1) { glUniform1i(uniform_lut, 8); }
GLuint uniform_fog_lut = glGetUniformLocation(shader->shader.handle, "fog_lut");
if (uniform_fog_lut != -1) { glUniform1i(uniform_fog_lut, 9); }
current_shader = shader_cache.emplace(config, std::move(shader)).first->second.get();
unsigned int block_index = glGetUniformBlockIndex(current_shader->shader.handle, "shader_data");
GLint block_size;
glGetActiveUniformBlockiv(current_shader->shader.handle, block_index, GL_UNIFORM_BLOCK_DATA_SIZE, &block_size);
ASSERT_MSG(block_size == sizeof(UniformData), "Uniform block size did not match!");
glUniformBlockBinding(current_shader->shader.handle, block_index, 0);
// Update uniforms
@ -974,6 +1016,8 @@ void RasterizerOpenGL::SetShader() {
SyncLightDistanceAttenuationBias(light_index);
SyncLightDistanceAttenuationScale(light_index);
}
SyncFogColor();
}
}
@ -1040,6 +1084,30 @@ void RasterizerOpenGL::SyncBlendColor() {
state.blend.color.alpha = blend_color[3];
}
void RasterizerOpenGL::SyncFogColor() {
const auto& regs = Pica::g_state.regs;
uniform_block_data.data.fog_color = {
regs.fog_color.r.Value() / 255.0f,
regs.fog_color.g.Value() / 255.0f,
regs.fog_color.b.Value() / 255.0f
};
uniform_block_data.dirty = true;
}
void RasterizerOpenGL::SyncFogLUT() {
std::array<GLuint, 128> new_data;
std::transform(Pica::g_state.fog.lut.begin(), Pica::g_state.fog.lut.end(), new_data.begin(), [](const auto& entry) {
return entry.raw;
});
if (new_data != fog_lut_data) {
fog_lut_data = new_data;
glActiveTexture(GL_TEXTURE9);
glTexSubImage1D(GL_TEXTURE_1D, 0, 0, 128, GL_RED_INTEGER, GL_UNSIGNED_INT, fog_lut_data.data());
}
}
void RasterizerOpenGL::SyncAlphaTest() {
const auto& regs = Pica::g_state.regs;
if (regs.output_merger.alpha_test.ref != uniform_block_data.data.alphatest_ref) {

17
src/video_core/renderer_opengl/gl_rasterizer.h
View file

@ -76,6 +76,9 @@ union PicaShaderConfig {
state.tev_stages[i].scales_raw = tev_stage.scales_raw;
}
state.fog_mode = regs.fog_mode;
state.fog_flip = regs.fog_flip;
state.combiner_buffer_input =
regs.tev_combiner_buffer_input.update_mask_rgb.Value() |
regs.tev_combiner_buffer_input.update_mask_a.Value() << 4;
@ -168,13 +171,14 @@ union PicaShaderConfig {
};
struct State {
Pica::Regs::CompareFunc alpha_test_func;
Pica::Regs::TextureConfig::TextureType texture0_type;
std::array<TevStageConfigRaw, 6> tev_stages;
u8 combiner_buffer_input;
Pica::Regs::DepthBuffering depthmap_enable;
Pica::Regs::FogMode fog_mode;
bool fog_flip;
struct {
struct {
@ -324,13 +328,14 @@ private:
GLint alphatest_ref;
GLfloat depth_scale;
GLfloat depth_offset;
alignas(16) GLvec3 fog_color;
alignas(16) GLvec3 lighting_global_ambient;
LightSrc light_src[8];
alignas(16) GLvec4 const_color[6]; // A vec4 color for each of the six tev stages
alignas(16) GLvec4 tev_combiner_buffer_color;
};
static_assert(sizeof(UniformData) == 0x390, "The size of the UniformData structure has changed, update the structure in the shader");
static_assert(sizeof(UniformData) == 0x3A0, "The size of the UniformData structure has changed, update the structure in the shader");
static_assert(sizeof(UniformData) < 16384, "UniformData structure must be less than 16kb as per the OpenGL spec");
/// Sets the OpenGL shader in accordance with the current PICA register state
@ -354,6 +359,10 @@ private:
/// Syncs the blend color to match the PICA register
void SyncBlendColor();
/// Syncs the fog states to match the PICA register
void SyncFogColor();
void SyncFogLUT();
/// Syncs the alpha test states to match the PICA register
void SyncAlphaTest();
@ -421,6 +430,7 @@ private:
struct {
UniformData data;
bool lut_dirty[6];
bool fog_lut_dirty;
bool dirty;
} uniform_block_data = {};
@ -432,4 +442,7 @@ private:
std::array<OGLTexture, 6> lighting_luts;
std::array<std::array<GLvec4, 256>, 6> lighting_lut_data{};
OGLTexture fog_lut;
std::array<GLuint, 128> fog_lut_data{};
};

34
src/video_core/renderer_opengl/gl_shader_gen.cpp
View file

@ -555,6 +555,7 @@ layout (std140) uniform shader_data {
int alphatest_ref;
float depth_scale;
float depth_offset;
vec3 fog_color;
vec3 lighting_global_ambient;
LightSrc light_src[NUM_LIGHTS];
vec4 const_color[NUM_TEV_STAGES];
@ -563,6 +564,7 @@ layout (std140) uniform shader_data {
uniform sampler2D tex[3];
uniform sampler1D lut[6];
uniform usampler1D fog_lut;
// Rotate the vector v by the quaternion q
vec3 quaternion_rotate(vec4 q, vec3 v) {
@ -580,6 +582,12 @@ vec4 secondary_fragment_color = vec4(0.0);
return out;
}
out += "float z_over_w = 1.0 - gl_FragCoord.z * 2.0;\n";
out += "float depth = z_over_w * depth_scale + depth_offset;\n";
if (state.depthmap_enable == Pica::Regs::DepthBuffering::WBuffering) {
out += "depth /= gl_FragCoord.w;\n";
}
if (state.lighting.enable)
WriteLighting(out, config);
@ -596,14 +604,30 @@ vec4 secondary_fragment_color = vec4(0.0);
out += ") discard;\n";
}
out += "color = last_tex_env_out;\n";
// Append fog combiner
if (state.fog_mode == Regs::FogMode::Fog) {
// Get index into fog LUT
if (state.fog_flip) {
out += "float fog_index = (1.0 - depth) * 128.0;\n";
} else {
out += "float fog_index = depth * 128.0;\n";
}
out += "float z_over_w = 1.0 - gl_FragCoord.z * 2.0;\n";
out += "float depth = z_over_w * depth_scale + depth_offset;\n";
if (state.depthmap_enable == Pica::Regs::DepthBuffering::WBuffering) {
out += "depth /= gl_FragCoord.w;\n";
// Generate clamped fog factor from LUT for given fog index
out += "float fog_i = clamp(floor(fog_index), 0.0, 127.0);\n";
out += "float fog_f = fog_index - fog_i;\n";
out += "uint fog_lut_entry = texelFetch(fog_lut, int(fog_i), 0).r;\n";
out += "float fog_lut_entry_difference = float(int((fog_lut_entry & 0x1FFFU) << 19U) >> 19);\n"; // Extract signed difference
out += "float fog_lut_entry_value = float((fog_lut_entry >> 13U) & 0x7FFU);\n";
out += "float fog_factor = (fog_lut_entry_value + fog_lut_entry_difference * fog_f) / 2047.0;\n";
out += "fog_factor = clamp(fog_factor, 0.0, 1.0);\n";
// Blend the fog
out += "last_tex_env_out.rgb = mix(fog_color.rgb, last_tex_env_out.rgb, fog_factor);\n";
}
out += "gl_FragDepth = depth;\n";
out += "color = last_tex_env_out;\n";
out += "}";

8
src/video_core/renderer_opengl/gl_state.cpp
View file

@ -58,6 +58,8 @@ OpenGLState::OpenGLState() {
lut.texture_1d = 0;
}
fog_lut.texture_1d = 0;
draw.read_framebuffer = 0;
draw.draw_framebuffer = 0;
draw.vertex_array = 0;
@ -195,6 +197,12 @@ void OpenGLState::Apply() const {
}
}
// Fog LUT
if (fog_lut.texture_1d != cur_state.fog_lut.texture_1d) {
glActiveTexture(GL_TEXTURE9);
glBindTexture(GL_TEXTURE_1D, fog_lut.texture_1d);
}
// Framebuffer
if (draw.read_framebuffer != cur_state.draw.read_framebuffer) {
glBindFramebuffer(GL_READ_FRAMEBUFFER, draw.read_framebuffer);

4
src/video_core/renderer_opengl/gl_state.h
View file

@ -67,6 +67,10 @@ public:
GLuint texture_1d; // GL_TEXTURE_BINDING_1D
} lighting_luts[6];
struct {
GLuint texture_1d; // GL_TEXTURE_BINDING_1D
} fog_lut;
struct {
GLuint read_framebuffer; // GL_READ_FRAMEBUFFER_BINDING
GLuint draw_framebuffer; // GL_DRAW_FRAMEBUFFER_BINDING